Which of the following sets is true?

Indian saltpeter - Nitrate ore

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Fluorspar - Oxide ore

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Pitchblende - Sulphide ore

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Galena - Sulphate ore

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Solution

The correct option is A Indian saltpeter - Nitrate ore
Minerals from which a metal can be extracted economically and conveniently is called ore.

Pitchblende : $U_{3} O_{8}$ - Oxide ore
Galena : $P b S$ - Sulphide ore
Fluorspar : $C a F_{2}$
Dolomite : $C a C O_{3} . M g C O_{3}$ - Carbonate ore
Anglesite : $P b S O_{4}$ - Sulphate ore
Iron pyrite : $F e S_{2}$ - Sulphide ore
Indian saltpeter : $K N O_{3}$ - Nitrate ore
Hence, options (a) is correct.

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